The correct answer is $(1,400). Please see correct answer for an explanation. The monthly cost for the advertising is $5,000 ($60,000 / 12). The advertising will increase sales by 10%, so the contribution margin will increase by $3,600 ($36,000 contribution margin × 1.10). Therefore, the advertising promotion will cost the company an additional $1,400 ($3,600 increase in contribution margin ? $5,000 advertising cost). This is incorrect since it does not include the increased sales from the promotion. The correct answer is $(1,400). Please see correct answer for an explanation.
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